rails-api/active_model_serializers — pull request #726 by kurko (2014-11-11 16:49:39+00:00)
Title: Bugfix: include nested has_many associations

Currently, doing `include: author.bio` would work correctly, but not for
has_many associations such as `include: author.roles`. This fixes it.

The problem was basically that we were not handling arrays for has_many linked,
as happens for ArraySerializers.